MBProgressHud实现透明效果

将MBProgressHUD.m文件中第1164行代码注释
注释不会对其他代码有影响，只是取消了毛玻璃效果

- (void)updateForBackgroundStyle {
    MBProgressHUDBackgroundStyle style = self.style;
    if (style == MBProgressHUDBackgroundStyleBlur) {
#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000 || TARGET_OS_TV
        if (kCFCoreFoundationVersionNumber >= kCFCoreFoundationVersionNumber_iOS_8_0) {
            UIBlurEffect *effect = [UIBlurEffect effectWithStyle:UIBlurEffectStyleLight];
            UIVisualEffectView *effectView = [[UIVisualEffectView alloc] initWithEffect:effect];
            // 注释下面这行代码，否则即使设置self.alpha，也会被effectView挡住
            // [self addSubview:effectView];
            effectView.frame = self.bounds;
            effectView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
            self.backgroundColor = self.color;
            self.layer.allowsGroupOpacity = NO;
            self.effectView = effectView;
        } else {
#endif

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